JPH0542431Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial field of application] This invention is a cartridge for photographic film, in particular,
This invention relates to a cartridge that stores photographic film made of roll film of 16 mm or 35 mm width.

[Conventional technology]

Generally, a photographic film cartridge has a beak-shaped film outlet 51 in a body 50, as shown in FIG. The lower lip portions 52' face each other from the lower surface side, and light-shielding ribbons 53, 53' are attached to these opposing surfaces. In this case, both side portions 54, 54' of the upper and lower light-shielding ribbons 53, 53' are connected to the upper and lower lip portions 52, 54', as shown in FIG.
52', and was bent downward at a right angle when the cap 55 was fitted.

[Problem that the invention attempts to solve]

However, in the case of the conventional cartridge, both side portions 54' of the light shielding ribbon 53' attached to the lower lip portion 52' are bent at right angles, and both side portions 54 of the upper light shielding ribbon 53 are bent at right angles. Because of the overlap, the end portion side becomes open, and it is not possible to maintain a large amount of pile overlap, making it impossible to ensure sufficient light-shielding properties. In addition, in the conventional cartridge, the lower light-shielding ribbon 53'
The sides of the cartridge were bent downward at right angles, which caused the cartridge to float when loaded into the cartridge chamber of the camera, making it difficult to maintain proper positioning within the camera. There were cases where there was none. This "floating" also makes it difficult for the cartridge to sit when pulling out the film loaded in the cartridge at a photo lab or the like, causing various problems such as the long time it takes to pull out the film.

This idea was developed to solve the above-mentioned problems.It is a photographic film that has good light-shielding properties, eliminates floating in the camera, allows for proper positioning, and improves the ease with which the film can be pulled out. The purpose is to provide a patrone for users.

[Means for solving problems]

In order to achieve the above object, this invention provides a photographic film cartridge in which light-shielding ribbons are attached to the inner surfaces of the upper and lower lip portions constituting the film outlet. Bend the overhang slightly downward, bend the overhangs on both sides of the light-shielding ribbon attached to the upper lip slightly downward, and increase the pressure of the overhangs on both sides of the upper and lower ribbons to create a pile. The structure is such that a large amount of overlap can be ensured.

〔Example〕

Next, this invention will be explained based on an embodiment shown in FIGS. 1 to 4.

In Fig. 1, 1 is a body, 2 is a cap that fits on both ends of the body 1, has a hole 2a in the center into which the shaft 3' of the spool 3 is fitted, and has a hole 2a on the outer periphery in which the body 1 is fitted. It has a U-shaped groove 2b into which both ends fit.

The body 1 is formed by rolling up a boat-shaped plate 1' shown in FIG. This boat-shaped plate 1' is provided with protruding parts 4 on both edges in the width direction that fit into the U-grooves 2b of the cap 2, and upper and lower lip parts 6, which serve as film outlet 5, on both ends in the length direction. 6'
is provided. The upper lip portion 6 extends flat, and the lower lip portion 6' is folded back into a hook shape so that when rolled up, they face each other in a beak shape as shown in the figure. Light-shielding ribbons 7 and 7' are attached to opposing surfaces of the upper and lower lip portions 6 and 6', respectively.

The light-shielding ribbons 7, 7' extend beyond the width of the lip part on both sides, and the projecting part 8' of the light-shielding ribbon 7' attached to the lower lip part 6' is slightly downward as shown in the third figure. The projecting portion 8 of the light-shielding ribbon 7 attached to the upper lip portion 6 is bent slightly downward (angle β). The angle α is preferably 0<α<10°, and the angle β is preferably 15°<β25°. Specifically, it is desirable that α = 4 to 8 degrees and β = 18 to 22 degrees.

That is, unlike the case where the overhanging portions on both sides of the light-shielding ribbons 7 and 7' are bent at right angles, the overhang length L can be used effectively, and the amount of overlap _l0 of the piles increases due to the increase in the pressing force. This is because the light shielding property is improved. In addition, it has been confirmed by Patrone's quality certification test that the relationship between pile overlap amount l ₀ and light shielding property is l ₀ ≧0.4 mm. This quality assurance test is a test in which the cartridge is irradiated with 80,000 Lux (xenon lamp) for 1 minute to check the state of fog on the film inside.

In order to form the bending angle α of the overhanging portion 8' of the light-shielding ribbon 7' and the bending angle β of the overhanging portion 8 of the light-shielding ribbon 7, the cartridge holder (clamper) 11 is adjusted as shown in FIG. 4a. Protrusions 12 and 12' for holding the protruding parts 8 and 8' of the light-shielding ribbons 7 and 7' are provided on the upper lip gripping side and the lower lip gripping side, respectively. When fitting the cap 2 to both ends of the part 1, cut the protruding part 8' of the light-shielding ribbon 7' on the lower lip part side with the edge (two-dot chain line) 2' of the skirt part of the cap, as shown in FIG. 13, or the two protruding portions 8, 8' may be thermally welded together.

[Effect of idea]

As explained above, this invention has been proposed in a photographic film cartridge in which light-shielding ribbons are attached to the inner surfaces of the upper and lower lip portions constituting the film outlet. The projecting part is bent slightly downward, and the protruding parts on both sides of the light-shielding ribbon attached to the upper lip part are bent slightly larger downwards, so that the protruding parts on both sides of the upper and lower ribbons are pressed together. It is possible to increase the amount of pile overlap by increasing the force.

Therefore, the light shielding property is perfect, and when the cartridge is loaded into the cartridge chamber of the camera, there is no "lifting" on the lower surface of the lower lip part.
It has various excellent effects, such as being able to maintain proper positioning within the camera, and making it easier and faster to pull out film from a cartridge at a photo lab.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an example of the cartridge of this invention, Fig. 2 is a perspective view of a boat-shaped plate, Fig. 3 is an enlarged front view of the main parts, and Fig. 4a is a cartridge holder used in the cartridge forming device. FIG. 5B is a perspective view showing the cut state of the light-shielding ribbon when the cap is fitted, and FIGS. 5A and 5B are a side sectional view and a partial front view of the conventional example. 1... Body, 2... Cap, 3... Spool, 5... Film outlet, 6, 6'... Upper and lower lip parts, 7, 7'... Light shielding ribbon, 8, 8'... Overhang Department.

Claims (1)

[Scope of utility model registration request] In a photographic film cartridge in which light-shielding ribbons are attached to the inner surfaces of the upper and lower lip portions constituting the film outlet, both sides of the light-shielding ribbon attached to the lower lip portion are slightly bent downward, and then bent. A photographic film cartridge characterized by a slightly larger light-shielding ribbon attached to the upper lip with both sides of the ribbon bent downward.